Well, typically you would want one rooster to ten hens depending on breed. I started with 10 hens. When they were 6 months old, I ordered 25 more. I ordered 15 pullets and 10 straight run. I ended up with 4 roosters to 31 hens.
I’m assuming because they grew up together, my roosters never fought. Some pecking here and there but no injuries. That ratio worked for me for a long time. My flock got bigger and smaller. Right now, I have 4 roosters and 18 hens. One rooster from the original 4 and 3 that my hens hatched. The coop is peaceful and the only issue is I had to put saddles on two of the most “popular” girls.
BUT I know my situation is not typical. I would raise them together and time will tell how many roosters you have. It will also tell you if you even have an issue. I would ask around and find a place for any extra roosters to go or have a separate area for them. Maybe you’ll end up with only 2 roosters. They can only guarantee 90% but it could be 100% or 95%.
Now wether or not the chickens free range will help with this decision. Mine free range every day so 4 roosters aren’t “cooped” up 24/7. If they were, I’d expect to have to get rid of some.